Remove static thread pointers from CC

cc/prioritized_texture.cc

Index: cc/prioritized_texture.cc
diff --git a/cc/prioritized_texture.cc b/cc/prioritized_texture.cc
index bb3ccb899f59aa63aea8b2ec02343004fc2d1a3d..ea014127fb2bd8580561fc860bf50ba4ce8f8de7 100644
--- a/cc/prioritized_texture.cc
+++ b/cc/prioritized_texture.cc
@@ -9,7 +9,6 @@
 #include "cc/platform_color.h"
 #include "cc/prioritized_texture_manager.h"
 #include "cc/priority_calculator.h"
-#include "cc/proxy.h"
 #include <algorithm>
 
 using namespace std;
@@ -153,7 +152,7 @@ PrioritizedTexture::Backing::~Backing()
 
 void PrioritizedTexture::Backing::deleteResource(ResourceProvider* resourceProvider)
 {
-    DCHECK(Proxy::isImplThread());
+    DCHECK(m_threadChecker.CalledOnValidThread());
     DCHECK(!m_resourceHasBeenDeleted);
 #ifndef NDEBUG
     DCHECK(resourceProvider == m_resourceProvider);
@@ -166,19 +165,19 @@ void PrioritizedTexture::Backing::deleteResource(ResourceProvider* resourceProvi
 
 bool PrioritizedTexture::Backing::resourceHasBeenDeleted() const
 {
-    DCHECK(Proxy::isImplThread());
+    DCHECK(m_threadChecker.CalledOnValidThread());
     return m_resourceHasBeenDeleted;
 }
 
 bool PrioritizedTexture::Backing::canBeRecycled() const
 {
-    DCHECK(Proxy::isImplThread());
+    DCHECK(m_threadChecker.CalledOnValidThread());
     return !m_wasAbovePriorityCutoffAtLastPriorityUpdate && !m_inDrawingImplTree;
 }
 
 void PrioritizedTexture::Backing::updatePriority()
 {
-    DCHECK(Proxy::isImplThread() && Proxy::isMainThreadBlocked());
+    DCHECK(m_threadChecker.CalledOnValidThread());

[danakj, 2012/10/25 05:06:06]

The main thread is blocked part here is kinda important, I'm not sure it makes
sense to remove that.

How about adding a for-debug method on PTM and have this call that? Since PTM
has a Proxy*

     if (m_owner) {
         m_priorityAtLastPriorityUpdate = m_owner->requestPriority();
         m_wasAbovePriorityCutoffAtLastPriorityUpdate = m_owner->isAbovePriorityCutoff();
@@ -190,7 +189,7 @@ void PrioritizedTexture::Backing::updatePriority()
 
 void PrioritizedTexture::Backing::updateInDrawingImplTree()
 {
-    DCHECK(Proxy::isImplThread() && Proxy::isMainThreadBlocked());
+    DCHECK(m_threadChecker.CalledOnValidThread());

[danakj, 2012/10/25 05:06:06]

ditto

     m_inDrawingImplTree = !!owner();
     if (!m_inDrawingImplTree)
         DCHECK(m_priorityAtLastPriorityUpdate == PriorityCalculator::lowestPriority());